Description
The MR series temperature controls are
designed for use with hot gas or electric heat
defrost in both refrigeration and freezer units.
Either time or temperature based defrost
termination may be selected.
The MR series incorporates control functions
such as compressor control, defrost
management, fan management, and alarm
management.

Features
• single package provides the functionality of
multiple components at a cost-effective
price
• mounting flexibility allows the control and
relay pack to be mounted together or
separately, facilitating multiple
configurations
• accurate, interchangeable temperature
sensor provides reliable control
performance with up to 300 ft. of wiring (an
offset is provided for longer wiring)
• easily readable temperature display can
show either evaporator or process
temperature at the touch of a button
• heavy-duty relays allow direct control of
compressors, fans, defrost heaters, and
alarms
• alarm management functions provide both
local alarm codes and a relay closure that
can be used to trigger a remote alarm or a
dial-out modem

Applications
These relay pack mounted controls provide
direct control of compressors up to 2 hp,
electric heater loads of up to 20 amperes, and
evaporator fan loads of up to 3/4 hp. The need
for separate relays is eliminated in these
applications.
In addition, the MR4PMUHV controls
combine the functionality of an
electromechanical thermostat, mechanical
clock, defrost termination device, and
temperature readout device with the accuracy
of electronic technology.